If the Community College that you attended was an Eligible Education Institute, which in most cases is, and you attended one Academic Semester per Tax Year and maintained a Half-Time status as a student, you do not qualify for the American Opportunity Credit. This credit is only applicable for the first Four Years of Post-Secondary Schooling.
Nevertheless there are other Credits and/or deductions that you may qualify for. TurboTax provides a thorough Interview in the Education section to determine which credits and/or deductions you may qualify for. Below is a TurboTax FAQ which explains the options still available to you:
https://ttlc.intuit.com/replies/3302271